The Tewingas were a tribe or clan of Anglo-Saxon England, whose territory was centred on the settlement of Welwyn in modern-day Hertfordshire,^[1] the site of an early Minster church,^[2] and the nearby settlement of Tewin.^[3] Its name means either "the people of Tiwa" or "the worshippers of the God Tew".^[3]

The tribe and its territory is mentioned in an Anglo Saxon charter of c.945.^[3] Its heartland was in the valley of the River Mimram on well-drained soils.^[1] The area shows strong continuity with earlier settlements,^[1] with the Welwyn area including an earlier Iron Age oppidum, a Roman small town and several Roman villas.^[4]